Amprobe DMIII-Multitest Power-Quality-Recorder Instrukcja Użytkownika Pobierz pdf (Strona 59)

AMPROBE

DMIII MULTITEST

EN-57

7.6. "POWER" FUNCTION

This function permits to display in real time the RMS value of AC/DC voltage, the peak and

ThdV value of the 3 phase voltages, the waveform of the 3 phase voltages, the RMS value

of AC/DC currents, the peak and Thdl of the 3 phase currents and the waveform of the 3

phase currents. Furthermore, the instrument calculates and displays the value of phase

and total active powers, the value of phase and total reactive and capacitive powers, the

value of phase and total power factors and cos.

7.6.1. Symbols

The position POWER has two working modes:

 METER

 WAVE

For voltage and current harmonics see paragraphs 7.4.3 and 7.5.3 respectively.

These modes will be described in detail in the next paragraphs.

The symbols used are described below:

Symbol

Description

V1, V2, V3

RMS value of voltage (phase 1, phase 2, phase 3 respectively)

V12, V23, V32, V31

RMS value of phase to phase voltages

freq

Network frequency

Phseq

Phase sequence indicator

"123" correct

"132" inverted

"023" null voltage on black wire

"103" null voltage on red wire

"120" null voltage on blue wire

"100" null voltages on red and blue wires

"020" null voltages on black and blue wires

"003" null voltages on black and red wires

I1, I2, I3

RMS value of current (phase 1, phase 2, phase 3 respectively)

RMS value of current of neutral

Pt, P1, P2, P3

Values of active power (total, phase 1, phase 2, phase 3 respectively)

P12, P32

(only for 3-wire measurement) value of power measured by Wattmeter 1-2 and 3-2

respectively

Qt, Q1, Q2, Q3

Values of reactive power (total, phase 1, phase 2, phase 3 respectively)

Q12, Q32

(only for 3-wire measurement) Value of power measured by VAR meter Va1-2 and

3-2 respectively

St, S1, S2, S3

Values of apparent power (total, phase 1, phase 2, phase 3 respectively)

S12, S32

(only for 3-wire measurement) Value of power measured by VA meter Va1-2 and 3-

2 respectively

Pft, pf1, pf2, pf3

Values of power factors (total, phase 1, phase 2, phase 3 respectively)

dPft, dpf1, dpf2, dpf3

Value of the cos (total, phase 1, phase 2, phase 3 respectively)

Ead, Pd

Values of total active energy and active power on demand respectively

Esd, Sd

Values of total apparent energy and apparent power on demand respectively

Tab. 3: Symbols used in the POWER function

The symbols "i" and "c" stand for reactive powers (Q), power factors (Pf) and cos (dpf),

inductive and capacitive respectively.

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 103 104

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